In the season opener, Vicki finds her life in turmoil once again, as her divorce from Donn is finalized and she struggles to move forward with Brooks after his controversial clash with Briana at last season's reunion. Tamra's gym is finally open for business, but she worries about staying in shape for her younger husband, Eddie. Meanwhile, Heather and her family are living on top of each other in their "small" rental house as she prepares to break ground on her new mega dream home. Newcomer Shannon gives Heather a peek into her quirky lifestyle choices. Heather ...
The Hawaii trip concludes with the ladies questioning Vicki about the status of her relationship with Brooks, and one last attempt by the ladies to get "Fancy Pants" Dubrow to put on her party pants. Back on the mainland, Heather introduces the ladies to her future neighbor, Shannon Beador, and Tamra invites the women over for a spooky-themed night of food and tarot card readings. At a dinner, Tamra reveals that she misses her kids and is thinking about having a baby with Eddie. After meeting the ladies, Shannon invites them over to her house for a "real" home cooked ...
The dinner party continues at Shannon's OC home, and while the ladies hop onboard the fun bus, Heather seems to have been left at the station. Meanwhile, Shannon's awkward marriage is put under the microscope, and Vicki finally musters the courage to tell Briana she is going to date Brooks with or without her blessing. As Heather leaves town for the holidays, the ladies meet for a "Fakes-giving" Feast where they air out their grievances.
Things get ugly in the OC when Tamra and Heather are invited to a holiday party where fashion takes a back seat to charity and the girls meet Lizzie, a former beauty queen. After 13 years of marriage, Shannon is surprised with a romantic weekend getaway. As Vicki focuses on business and new office with designer Kelli Ellis, Tamra and Eddie have a heart-to-heart discussion about a possible new addition to the family.
Shannon and Vicki bond when Shannon takes Vicki to her holistic healer and brings her Feng Shui expert to her office. While Heather is busy planning a hoedown-themed party to celebrate breaking ground on her new house, Lizzie is overwhelmed at home and Tamra pushes for her reluctant son Ryan to take on more responsibility at the fitness studio. A holiday outing turns tense when Vicki and Lizzie don't get along, and Heather and Shannon fight over, of all things, a chair.
The tension remains between Heather and Shannon after their disagreement over seating arrangements at the holiday dinner outing. Meanwhile, Vicki continues to struggle with her daughter's decision to move to Oklahoma as Briana asks her to come along on a house-hunting trip. Heather hosts her closest friends and family for a hoedown-themed breaking ground party for their new house. Despite the festive mood, not all is calm at the Dubrow Ranch, and after taking a ride on the mechanical bull, one of the ladies ends up at urgent care.
A trip to Oklahoma causes Vicki massive emotional stress as she helps her daughter, Briana, look for a house. Back in Orange County, Heather and Shannon try to make sense of the massive rift in their friendship, leaving Lizzie caught in the crossfire of accusations and hearsay. Later, Tamra is shocked as she discovers that her son Ryan is possibly endangering his health by taking a potentially harmful medication without a prescription.
Shannon is excited about her annual Christmas party, but holiday cheer quickly turns into holiday jeer when the ladies get together. Meanwhile, Vicki mourns Briana's move to Oklahoma, and Tamra gets a dose of reality when she gets some shocking news about her son.
Tamra reveals her real reason for being upset with Heather. Meanwhile, Briana and Ryan surprise Vicki with the gender of their baby and later, Shannon turns to Tamra for support when her husband, David, sends her a shocking e-mail about their relationship.
While confiding in Tamra, Shannon receives a text from David that rumors are swirling around the OC about their marriage. Shannon heads to Heather's house to find out the source of the rumors, only to be turned away. Lizzie is caught in the middle of Shannon and Heather's argument and left to decide who to believe. Meanwhile, Vicki and Brooks head to Puerto Vallarta for a much needed vacation, and Tamra orders a Robotic baby to show Eddie what it's like to have a newborn.
After being banished from the Dubrow household, Shannon makes a run for the border to join Vicki and Brooks in Puerto Vallarta. Back in the OC, Lizzie's personal life is put under the microscope as she tries to balance work and family, while Heather hires a personal chef to maximize her time with her husband and children. Meanwhile, Tamra's experiment of trying to teach Eddie a lesson in fatherhood backfires, leaving her the proud single mother of a robot baby.
After a heated dinner in Mexico, Shannon and David try to get the night and their marriage back on track with the help of Vicki. Back in the OC, Heather expands her family with new puppies while Tamra and Eddie make a final decision about their new addition Astro. Meanwhile, Lizzie pounds the pavement and tries to take her business to the next level.
When Lizzie invites the women to a dinner party at her family's beach house, tensions are high as Shannon and Heather come face-to-face for the first time since Heather kicked Shannon out of her house. Vicki brings Brooks to the party in hopes for a clean slate for him and Tamra. After a fiery show on the beach, tempers flare once again when a big accusation is made.
Lizzie's dinner party continues where tensions between Shannon and Heather reach a boiling point, leaving the ladies to pick sides. Later, Vicki and Briana see a therapist to face the "Brooks issue" once and for all. Meanwhile, Tamra is shocked when Ryan gives his two week notice from the gym, but is blindsided during a family dinner where Ryan and his new girlfriend, Sarah, drop a bomb that leaves Tamra in tears.
Heather and Tamra decide to take a girls trip to Bali, but they struggle with whether they should extend an olive branch to Shannon. Meanwhile, Lizzie has one of the worst birthdays ever. Later, love is in the air, when Heather throws a spectacular Valentine's Day dinner party with sexy games and shenanigans.
Balinese bliss becomes a rumble in the jungle when the ladies set out on a trip to Bali. Heather and Shannon hope for peace and relaxation, but things escalate when Shannon gets some shocking news. Meanwhile, Vicki hears about a scandalous statement allegedly made at the Valentine's Day dinner and Lizzie reveals her true thoughts about Tamra.
It's more fish-out-of-water time for the ladies in Bali as everything seems to be more fun than a barrel of monkeys. However, beneath the surface, tensions escalate as Shannon and Lizzie compare notes and realize Tamra has poisoned their budding friendship. Then, Vicki is shocked when she hears allegations that Tamra has been talking trash about Brooks. Although Heather begins to see some hope for reconciliation between her and Shannon, everything comes to a head at dinner when the ladies confront Tamra about being two-faced.
The women gather at Vicki's for a post Bali dinner party and with leftover tensions from the trip still running high, the ladies lay everything on the table. Tamra comes face-to-face with Brooks, and an apology from Shannon's husband David sparks an unexpected fight. Meanwhile, Vicki's daughter Briana and Tamra's son Ryan officially say goodbye to the OC, leaving their mothers in tears.
In part one of the reunion, the ladies come face-to-face to deal with the hot issues and conflicts of the season. Lizzie clashes with Tamra while Heather and Shannon delve into their tumultuous, rollercoaster relationship, with Terry and David joining the fray to address their on-going issues. Tamra opens up about Ryan's sudden life-changing decision to move away. Plus, Vicki Skypes with Briana and the ladies get to see Vicki's new grandchild.
There are laughs, tears and tirades in part two of the reunion as Shannon explains her holistic ways as only Shannon can do. The ladies argue over whether Lizzie is more drama queen than beauty queen, and the gloves are off when Tamra faces her accusers on whether or not she's to blame for much of this season's conflicts.